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一、目的和意义由于光栅刻制时不可避免的一些问题以及表面镀层反射系数的改变等原因,定向光栅的闪耀波长与实际效率一般并不能与理论计算一致,而制造者所给出的仅仅是在Littrow装置下一级光谱的闪耀波长和其中几个波长的相对效率,与实际使用状态往往相差甚远,因此,若想了解某一闪耀光栅在实际使用状态下的闪耀波长与绝对效率(absolute grating efficiencies),就必须在相同的条件下测定它的绝对强度分布,它较之相时效率能更真实更准
First, the purpose and significance Due to the inevitable problems of grating engraving and the change of the reflection coefficient of the surface coating, the blazed wavelength and the actual efficiency of the directional grating can not generally be in accordance with the theoretical calculation, but the manufacturer just gives The shining wavelength and the relative efficiencies of several of the wavelengths below the Littrow device are often far from what is actually used. Therefore, if one wants to know the blaze wavelength and absolute efficiency of a blazed grating in actual use Since it is necessary to determine its absolute intensity distribution under the same conditions, it can be more true and accurate than the phase efficiency